Why do some versions of toupper act strangely if given an upper-case letter? []

tr(1) - translate characters {oss}

unvis(1) - revert a visual representation of data back to original form {oss}

GNU recode - converts files between character sets and usages. When exact transliterations are not possible, it may delete the offending characters or fall back on approximations. {GPL,GNU}

p5-Convert-Recode-1.03 - Front end to the GNU recode program

siconv-0.2 - Convert data from one character set to another

morsecode - ASCII->Morse Code filter {oss}

isalpha isupper islower isdigit isxdigit isalnum isspace ispunct isprint isgraph iscntrl isblank isascii toupper tolower toascii (3) - character classification macros {oss}

isalnum (3) - alphanumeric character test {oss}

isalpha (3) - alphabetic character test {oss}

isascii (3) - test for ASCII character {oss}

isblank (3) - blank-space character test {oss}

iscntrl (3) - control character test {oss}

isdigit (3) - decimal-digit character test {oss}

isgraph (3) - printing character test (space character exculsive) {oss}

islower (3) - lower-case character test {oss}

isprint (3) - printing character test (space character inclusive) {oss}

ispunct (3) - punctuation character test {oss}

isspace (3) - white-space character test {oss}

isupper (3) - upper-case character test {oss}

isxdigit (3) - hexadecimal-digit character test {oss}

tolower _tolower (3) - upper case to lower case letter conversion {oss}

toascii (3) - upper case to lower case letter conversion {oss}

toupper _toupper (3) - lower case to upper case letter conversion {oss}

unvis strunvis (3) - decode a visual representation of characters {oss}

vis strvis strvisx (3) - visually encode characters {oss}

libiconv-1.7_3 - A character set conversion library

Ascii.H - Convenient enumeration for ASCII control characters {oss}

A2E.H,A2E.C - ASCII <=> EBCDIC conversions {oss}

Toascii.C - EBCDIC-ASCII conversion arrays {oss}

Ctrlprnt.H,Ctrlprnt.C - Print a line, displaying Ctrl characters {oss}

Libraries and Functions

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Up to Text Strings - Gateway topic to character and string processing routines. NUL Terminated String processing String conversions,et al. ascii to long, long to